First defined in: FKiSS4
The letinity action sets the value of variable to the
initial vertical position of target for the current set (page).
variable
variable must be a variable name.
target
In FKiSS4, target may be an object number or a
variable representing an object number.
Example:
;@ letinity(Y, #5) ; Put the initial vertical position of object #5 into variable Y.
;@ letinity(Y, VarObj) ; Put the initial vertical position of the object identified by variable VarObj into variable Y.